JP2670804B2 - Coating composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating composition having excellent adhesion to a concrete base material, steel material, etc., capable of coating a thick film, and having excellent water resistance and acid resistance. Regarding things.

[Conventional technology]

Conventionally, various surface treatments have been performed in order to protect the surfaces of steel materials such as concrete substrates and pipes from damages caused by various chemical erosion. For example, concrete base materials are often exposed to the atmosphere, and water resistance and acid resistance are required to prevent damage to the base material from acid rainwater caused by sulfur oxides, nitrogen oxides, etc. in the air, and synthetic resins are required. Etc. are being coated. Concrete base material,
What is important for coating the surface of steel etc. with synthetic resin is to completely cover the exposed surface of concrete base material, steel etc. so that no pinholes remain,
In particular, since many large and small pores are present on the surface of the concrete base material, it takes a lot of labor and time to satisfy the above requirements.

Further, in recent years, coating film coating compositions have been used in various fields.

There are two types of coating compositions, one in which a coloring material is dissolved in an organic solvent and the other in which a water-soluble one is used at present. Due to the emulsifier present in the coating film, the hydrophilicity of the coating film is large and there is a problem in water resistance.

Further, a coating film coating composition adapted to water resistance and acid resistance,
It exhibits sufficient fluidity during coating, and has workability such that it does not sag when coated with a film thickness of about 10 mm.
In addition, it is required to have excellent adhesion to the base material even in expansion and contraction due to temperature change.

[Problems to be solved by the invention]

To completely protect the substrate surface by coating using a conventionally used coating composition, in order to completely prevent corrosion, when performing coating, the substrate surface must be in a dry state, Especially when applying organic solvent paint or molten resin to concrete products,
It has to be done after a sufficient drying process, and there is a problem in construction, such as a long working process. Further, a coating composition using an organic solvent is not preferable in terms of working environment, and the use of a water-soluble coating composition is preferable.However, these water-soluble compositions are highly hydrophilic due to the presence of an emulsifier. In addition, there was a problem that the water resistance of the coating film was low.

The present invention solves the above problems and protects the surface of concrete base materials, steel materials, etc., so that workability is excellent and water resistance,
It is an object to provide a coating film coating composition having acid resistance.

[Means for solving the problem]

The present inventors have conducted intensive studies to develop a coating composition having excellent adhesion to a substrate, water resistance, acid resistance, and workability.As a result, the vehicle has an average particle size of 5 to 200 μm. It has been found that the above requirements are satisfied by mixing a synthetic resin powder, and the present invention has been achieved.

The present invention is a paint coating composition comprising, as active ingredients, a coloring agent comprising one or a mixture of two or more selected from the group consisting of asphalt, a synthetic resin, and a cellulose derivative, and a synthetic resin powder.

As a component of the color developing agent that can be used in the coating film coating composition of the present invention, asphalt such as petroleum-based asphalt and natural asphalt, alkyd resin, epoxy resin, acrylic resin, melamine resin, urethane resin, vinyl resin or Examples thereof include synthetic resins having a molecular weight of about 3000 or more such as resin derivatives or copolymer resins, and cellulose derivatives such as carboxymethyl cellulose (CMC) and hydroxyethyl cellulose. From the viewpoint of water resistance and chemical resistance, those mainly containing asphalt are preferable.

On the other hand, the synthetic resin powder used in the composition of the present invention includes alkyd resin, epoxy resin, silicone resin, phenol resin, polyester resin, acrylic resin, acetal resin, polyethylene resin, polyether resin, polycarbonate resin, polysulfone resin, and polystyrene resin. , Thermosetting resin powder or thermoplastic resin powder such as polyvinyl chloride resin, fluorine resin, polypropylene resin, or copolymer resin powder of these, further powder paint collection, resin powder generated in the polishing step of resin molding, The resin powder generated by pulverizing the resin waste may be used, and the synthetic resin as a raw material of the synthetic resin powder may be one that is solid at room temperature. It is also possible to use a synthetic resin powder containing a pigment.Specific examples include inorganic pigments such as titanium oxide, cadmium sulfide, iron oxide and chromium oxide, and organic pigments such as copper phthalocyanine blue and condensed polyazo yellow. I can give you.

By mixing the color-developing agent with the synthetic resin powder, it is possible to obtain a coating film coating composition which exhibits excellent adhesion to a substrate, water resistance and acid resistance, and excellent workability. Any of the synthetic resin powders may be adjusted to a size of about 200 μm or less, more preferably about 5 to 100 μm, by any known method. That is, if the particle size of the synthetic resin powder is too large, the workability is deteriorated due to the increase in viscosity of the obtained composition, the decrease in fluidity, and the like.

The above synthetic resin powder is approximately 1 part by weight per 100 parts by weight of the color developing agent.
It is used in a proportion of 0 to 500 parts by weight, preferably about 50 to 350 parts by weight.

If the amount of synthetic resin powder is too small, water resistance,
It is not preferable because the acid resistance decreases. Also, if the amount of the synthetic resin powder is too large, the resulting composition will have a high viscosity, causing problems in the coating operation, and furthermore, the formed coating film will be in a state of a shortage of a coloring agent, and concrete, steel materials, metal materials It is not preferable because sufficient adhesive force to a base material cannot be obtained.

When the synthetic resin powder contains a pigment, it is preferably about 30 to 60 parts by weight, preferably about 40 parts by weight, relative to 100 parts by weight of the synthetic resin powder.
It is used in a proportion of ~ 50 parts by weight. By using a synthetic resin powder containing a pigment or a resin powder of a colored powder coating material recovery product, it is possible to color a coating film coating composition mainly composed of asphalt and a color developing agent.

The coating film coating composition of the present invention is prepared by mixing a color-developing agent and water with stirring to disperse or emulsify the color-developing agent in water in the presence or absence of a dispersant or an emulsifier, and then to prepare a synthetic resin powder. In addition, it is made into a paint by stirring and mixing. In this case, if necessary, usual additives such as viscosity modifiers and antifreezing agents, and organic fibers such as vinylon fibers and polyethylene fibers may be blended to prevent cracking of the coating film and to adjust fluidity. Various organic solvents can be used for coating, but they are not preferable in the work environment.

The coating film coating composition obtained by the above operation has a viscosity of about 1
It is preferable to adjust the properties so as to have a property in the range of 000 to 100,000 cp (20 ° C., rotation speed 3 rpm). Although it is possible to apply it to a concrete base material, steel material, etc. by any known method such as application by spraying, etc., spray application is preferable from the viewpoint of improving workability.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention is highly useful because it can be solved by a simple means when protecting the surface of a concrete base material, a steel material or the like from damage due to chemical corrosion such as acid corrosion. That is, according to the present invention, with regard to the prevention of surface corrosion of steel materials such as concrete substrates and pipes, water-based coatings having good adhesion to various substrates, having water resistance and acid resistance, and having excellent workability capable of being colored. It provides a film coating composition and has a great industrial value.

〔Example〕

Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

In the following Examples and Comparative Examples, coating film coating compositions were prepared by adding water so that the solid content concentration of each color-developing agent was about 1 to 60% by weight, and then 100 parts by weight of the color-developing agent in the emulsion. Against about 50
An acid resistance test was carried out by adding ~ 350 parts by weight of synthetic resin powder and mixing by stirring.

The acid resistance test was carried out by molding the above composition into a disk shape with a diameter of 40 mm and a thickness of 5 mm, and drying it to obtain 600 ml of a 1N (specified) sulfuric acid solution.
The change after immersion in 50 ° C for 72 hours was examined.

Table 1 shows Examples and Comparative Examples of the coating film coating composition of the present invention. Table 2 shows the acid resistance test results of the compositions obtained in Table 1 and the lightness measurement results of Examples 1, 2, 3 and Comparative Examples 1, 3.

The hardness change is JIS-K using a spring hardness tester.
-6301 Vulcanized rubber Measured in accordance with "5.2 Spring hardness test" of the physical test method.

The change in weight after drying was determined by measuring the weight after drying at 50 ° C. for 4 hours.

The lightness was measured in accordance with "3.2 Lightness display symbol" of JIS-Z-8721 three attribute color display method.

The composition of the present invention has no change in diameter even after the acid resistance test, has very little change in hardness and weight, has no change in weight after drying, and is excellent in water resistance and acid resistance. Further, by incorporating a pigment into the synthetic resin powder, the coating composition can be colored.

───────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C09D 195: 00) (C09D 201/00 195: 00 101: 00) (56) References JP Akira 59-131664 (JP, A) JP-B 40-9129 (JP, B1) JP-B 57-31753 (JP, B2)

Claims (1)

(57) [Claims] 1. An active ingredient comprising a vehicle comprising asphalt, at least one mixture selected from the group consisting of a synthetic resin and a cellulose derivative, and a synthetic resin powder having an average particle size of 5 to 200 μm. Coating composition.